A system (100) for displaying time or time derivative information, in particular a measured time, the system including a limb (10) comprising at least one modifiable graphic element (20a-f) forming time or time derivative reference information, a member (1) for indicating the time or time derivative information in cooperation with the limb, a device (2, 8, 22, 71) for modifying the graphic element, and a device (3, 4, 34) for resetting, by action of a user, to a predetermined configuration, in particular for resetting to zero, the time or time derivative information displayed by cooperation of the indication member and of the limb.

A timepiece mechanism for returning the seconds hand to zero, which includes a seconds arbor; a seconds hand; a cam forming a snail cam path which extends in a spiral around the seconds arbor from an inner end to an outer end connected to each other by a radial stop surface; a hammer carrying a cam follower, rotatably mounted about a hammer axis between a disengaged position wherein the cam follower is removed from the cam path and an engaged position wherein the cam follower presses on the cam path; a retaining ratchet system including a toothed wheel and a click which engages with the toothed wheel.

A method for operating a counting device (90), such as a countdown device, or a timepiece movement (100) or a timepiece (200), the method including performing a first action on a first control member (C1) causing a first timepiece function to be returned to an initial state, and then performing a second action on the first control member (C1) causing an action of adjusting or winding a second timepiece function.

An “all or nothing” actuating mechanism for a timepiece movement is described, which includes: an actuating lever that is able to move between an inactive position and an active position; a movable control lever for moving the actuating lever between its inactive and active positions; a return member for returning the control lever to its initial position; and a control member capable of pivoting between a first state in which it locks the actuating lever in its inactive position, and a second state, in which it releases the actuating lever to allow it to move to its active position. The control lever is arranged to be able to act on the control member, and move it from its first state to its second state, the actuating mechanism including a jumper tending to return the control member to its first state.

An all or nothing actuating mechanism for a timepiece movement is described, which includes: an actuating lever that is able to move between an inactive position and an active position; a movable control lever for moving the actuating lever between its inactive and active positions; a return member for returning the control lever to its initial position; and a control member capable of pivoting between a first state in which it locks the actuating lever in its inactive position, and a second state, in which it releases the actuating lever to allow it to move to its active position. The control lever is arranged to be able to act on the control member, and move it from its first state to its second state, the actuating mechanism including a jumper tending to return the control member to its first state.

A system (100) for displaying time or time derivative information, in particular a measured time, the system including a limb (10) comprising at least one modifiable graphic element (20a-f) forming time or time derivative reference information, a member (1) for indicating the time or time derivative information in cooperation with the limb, a device (2, 8, 22, 71) for modifying the graphic element, and a device (3, 4, 34) for resetting, by action of a user, to a predetermined configuration, in particular for resetting to zero, the time or time derivative information displayed by cooperation of the indication member and of the limb.

A chronograph mechanism including a zero-reset mechanism for resetting a chronograph counter to zero, including a zero-reset member and a hammer shaped to cooperate with the zero-reset member. The zero-reset member is a snail cam including a cam track extending in a spiral. The hammer can be displaced by the zero-reset control between a rest position in which the hammer is not in contact with the cam path and a zero-reset position in which the hammer is in contact with the cam path and holds the zero-reset member in the reference position, the hammer generating a driving torque on the zero-reset member between the rest position and the zero-reset position.

A timepiece mechanism for returning the seconds hand to zero, which includes a seconds arbor; a seconds hand; a cam forming a snail cam path which extends in a spiral around the seconds arbor from an inner end to an outer end connected to each other by a radial stop surface; a hammer carrying a cam follower, rotatably mounted about a hammer axis between a disengaged position wherein the cam follower is removed from the cam path and an engaged position wherein the cam follower presses on the cam path; a retaining ratchet system including a toothed wheel and a click which engages with the toothed wheel.

A horological movement (1) including a running train (100) driven by a first power source (150) and regulated by a regulating member (120); a chronograph mechanism (10) including a chronograph train (20) driven by a second power source (35) including a chronograph counter (23) having a counter wheel (231); a chronograph start/stop control device (30) configured to couple on demand the chronograph train (20) to the regulating member (120); a reset mechanism (40) for resetting said chronograph counter (23), including a reset control (60) movable between a neutral rest position and a reset position; the chronograph mechanism (10) including a lever (70) configured to be controlled by the chronograph start/stop control device (30) between a first stable position wherein the lever (70) blocks the rotation of the counter wheel (231) and a second stable position, wherein the counter wheel (231) is free to rotate.

Timepiece wheel set (1) including an arbor (3) carrying a wheel (4), and a heart cam (2) in an angularly indexed position with respect to the wheel (4), the heart cam (2) is freely mounted in a radial direction (R) with respect to the axis (D) of the arbor (3), and is returned in a neutral position towards the axis (D) by at least one flexible element (6), which is either a strip (25; 26) incorporated in the heart cam (2), or a spring (60) inserted between the wheel (4) and the heart cam (2), and the flexible element (6) is dimensioned to damp impacts applied to a peripheral cam track (23) comprised in the heart cam (2).